DUAL FUEL SUPPLY SYSTEM, METHODS FOR SWITCHING BETWEEN DIFFERENT FUEL TYPES AND METHOD FOR RETRO-FITTING A HEAVY FUEL SYSTEM

摘要

A dual fuel supply system for supplying a heavy fuel oil, a light fuel, such as Marine Gas Oil or Marine Diesel Oil, or a mixture of heavy fuel and light fuel to a combustion unit is disclosed, comprising cooling means arranged for cooling the contents of the light fuel storage tank. Furthermore, methods for switching from heavy fuel operation to light fuel operation and back are also disclosed. By cooling the light fuel storage tank, it is made redundant to build in a fuel cooler before the combustion unit so that the parts of the combustion unit, such as pumps and nozzles, that require a certain viscosity level to function properly will operate with the light fuel or the mixture of the light fuel and heavy fuel.